From: Li Yang <leoyang.li@nxp.com>
To: shawnguo@kernel.org, devicetree@vger.kernel.org
Cc: robh+dt@kernel.org, linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, Biwen Li <biwen.li@nxp.com>,
Li Yang <leoyang.li@nxp.com>
Subject: [PATCH v4 4/5] arm64: dts: ls208xa-rdb: fix errata E-00013
Date: Wed, 14 Sep 2022 16:15:37 -0500 [thread overview]
Message-ID: <20220914211538.29473-5-leoyang.li@nxp.com> (raw)
In-Reply-To: <20220914211538.29473-1-leoyang.li@nxp.com>
From: Biwen Li <biwen.li@nxp.com>
Specify a channel zero in idle state to avoid enterring tri-stated state
for PCA9547.
Some information about E-00013:
- Description: I2C1 and I2C3 buses are missing pull-up.
- Impact: When the PCA954x device is tri-stated, the I2C bus will float.
This makes the I2C bus and its associated downstream devices
inaccessible.
- Hardware fix: Populate resistors R189 and R190 for I2C1 and resistors
R228 and R229 for I2C3.
- Software fix: Remove the tri-state option from the PCA954x
driver(PCA954x always on enable status, specify a channel zero in dts to
fix the errata E-00013).
Signed-off-by: Biwen Li <biwen.li@nxp.com>
Signed-off-by: Li Yang <leoyang.li@nxp.com>
---
arch/arm64/boot/dts/freescale/fsl-ls208xa-rdb.dtsi | 2 ++
1 file changed, 2 insertions(+)
diff --git a/arch/arm64/boot/dts/freescale/fsl-ls208xa-rdb.dtsi b/arch/arm64/boot/dts/freescale/fsl-ls208xa-rdb.dtsi
index f8135c5c252d..3d9647b3da14 100644
--- a/arch/arm64/boot/dts/freescale/fsl-ls208xa-rdb.dtsi
+++ b/arch/arm64/boot/dts/freescale/fsl-ls208xa-rdb.dtsi
@@ -49,6 +49,8 @@ pca9547@75 {
reg = <0x75>;
#address-cells = <1>;
#size-cells = <0>;
+ idle-state = <0>;
+
i2c@1 {
#address-cells = <1>;
#size-cells = <0>;
--
2.37.1
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next prev parent reply other threads:[~2022-09-14 21:17 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-09-14 21:15 [PATCH v4 0/5] ls208xa dts updates Li Yang
2022-09-14 21:15 ` [PATCH v4 1/5] arm64: dts: ls208xa-qds: add mdio mux nodes from on-board FPGA Li Yang
2022-09-14 21:15 ` [PATCH v4 2/5] arm64: dts: ls2080a-rdb: add phy nodes Li Yang
2022-09-14 21:15 ` [PATCH v4 3/5] arm64: dts: ls2081a-rdb: Add DTS for NXP LS2081ARDB Li Yang
2022-09-14 21:15 ` Li Yang [this message]
2022-09-14 21:15 ` [PATCH v4 5/5] arm64: dts: ls208x: remove NXP Erratum A008585 from LS2088A Li Yang
2022-09-16 12:10 ` [PATCH v4 0/5] ls208xa dts updates Shawn Guo
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